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480:{{Information |Description={{en|1=Origional caption: "Fig. 25. Method of Working the Georges Creek Big Vein, 1850." This illustrates room and pillar mining in its primitive form. There is no obvious ventilation planning, and both pillar sizes and head
168:, University of Illinois, page 91. Reprinted from H. V. Hesse and E. M., Maximum Recover of Coal Illustrations of Wasteful Early Methods of Mining in the Georges Creek Region and Suggested Economic Methods,
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for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and
Switzerland. The creator and year of publication are essential information and must be provided. See
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The text states that this plan is based on an actual survey, probably done in a mine near
Frostburg Maryland. It would be interesting to track it down to its original location.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
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Percentage of
Extraction on of Bituminous Coal with Special Reference to Illinois Conditions,
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occurred prior to
January 1, 1929, and if not then due to lack of notice or renewal. See
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ventilation shaft where a fire was maintained to improve air circulation.
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166:Engineering Experiment Station Bulletin No. 100
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172:Vol. XXIX, No. 8 (March, 1909), page 374.
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372:March 1909
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